890CS & 890CD Common Bus Units
Page
4-56
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
8
9
10
11
A
B
C
D
1
2
3
4
5
6
7
E
Setting the Encoder Sign (Closed-Loop Vector Mode)
If you have performed a Stationary Autotune in Closed-loop Vector mode, you should check the encoder
direction as follows:
Look and listen to the motion of the motor when the drive is running at a speed demand of between 5 -
10%.
As a test, use the
Up
(
S
) control key to increase the speed to about double the original figure. Change the
direction of rotation using the
FWD/REV
control key.
If ENCODER INVERT is correct, the motor will rotate smoothly and will respond to the changes in speed
demand and direction.
If ENCODER INVERT is incorrect, the motor will rotate in a jerky and/or noisy manner. Alternatively, it
may rotate smoothly at a very low speed but not respond to changes in speed demand or direction.
•
Change the setting of ENCODER INVERT to change the encoder sign.
•
Change the direction of rotation back to the original direction. Re-set the speed demand.
The encoder sign is now correct for the original motor direction.
If however the direction of the motor is incorrect at this point, then power down the entire drive, wait for 3
minutes (for the dc link capacitors to discharge) and then swap the motor drive cables M1/U and M2/V.
Change the setting of ENCODER INVERT.
The encoder sign is now correct for the new motor direction.
IMPORTANT
Now perform a SAVE CONFIG to save your new settings. Refer to Chapter 8: “The Keypad” -
SAVE CONFIG.
